So they could easily put a two-sided map into the rotation in the main arena and it wouldn't cost $600,000 to do it.
Except that it wouldn't function properly.
Also, HT would never allow it, even if it did. He doesn't think a 2-sided design makes a good arena. Period. Full stop.
If you want to argue that point, that is another discussion. But that was his stance last time I saw him comment of the option.
You can't test the idea in another arena because I was told no other side arena is allowed to have win-the-war. And you wouldn't want to divide the already low numbers.